This is from one section of the logo trends article (https://www.logolounge.com/articles/2018-logo-trends https://www.logolounge.com/articles/2018-logo-trends).

This is from one section of the logo trends article (https://www.logolounge.com/articles/2018-logo-trends https://www.logolounge.com/articles/2018-logo-trends). If you look through the pictures of logos in the full article, all but a very few use sans serif fonts. A more accurate title may be, "A few new logos use serif fonts".